The effect of grain size on the thermoelectric properties n-type nanocrystalline bismuth-telluride based thin films is investigated. We prepare with average sizes 10, 27, and 60 nm by a flash-evaporation method followed hydrogen annealing process. properties, in terms thermal conductivity differential 3ω method, electrical conductivity, Seebeck coefficient are measured at room temperature used to evaluate figure merit. minimum 0.61 W m−1 K−1 10 nm. also estimate lattice compare it simplified...

Thermoelectric generators with flexibility and high performance near 300 K have the potential to be employed in self-supporting power supplies for Internet of Things (IoT) devices. Bismuth telluride (Bi2Te3) exhibits thermoelectric performance, single-walled carbon nanotubes (SWCNTs) show excellent flexibility. Therefore, composites Bi2Te3 SWCNTs should exhibit an optimal structure performance. In this study, flexible nanocomposite films based on nanoplates were prepared by drop casting a...

The thermal conductivity of n-type nanocrystalline bismuth-telluride-based thin films (Bi2.0Te2.7Se0.3) is investigated by a differential 3ω method at room temperature. are grown on glass substrate flash evaporation method, followed hydrogen annealing 250 °C. structure the studied means atomic force microscopy, x-ray diffraction, and energy-dispersive spectroscopy. exhibit an average grain size 60 nm cross-plane 0.8 W∕m K. in-plane electrical Seebeck coefficient also investigated. Assuming...

Here, we investigate the combined effect of nanoscale crystal grains and porosity on lattice thermal conductivity bismuth-telluride-based bulk alloys using both experimental studies modeling. The fabricated exhibit average grain sizes 30 < d 60 nm porosities 12% Φ 18%. total conductivities were measured a laser flash method at room temperature, they in range 0.24 to 0.74 W/m/K. To gain insight into phonon transport nanocrystalline nanoporous alloys, estimate compare them with those...

Abstract Bismuth telluride (Bi 2 Te 3 ) is a promising thermoelectric material for applications near room temperature. To increase the performance of this material, its dimensions and thermal transport should be decreased. Two-dimensional nanoplates with nanopores are an ideal structure because disrupted by nanopores. We prepared Bi single solvothermal synthesis investigated their structural crystallographic properties. The synthesized at lower reaction temperature (190 °C) developed...

This report presents n-type single-walled carbon nanotubes (SWCNT) films with ultra-long air stability using a cationic surfactant and demonstrates that the Seebeck coefficient can be maintained for more than two years, which is highest reported thus far to best of our knowledge. Furthermore, SWCNT exhibit an extremely low thermal conductivity 0.62 ± 0.08 W/(m·K) in in-plane direction, very useful thin-film TEGs. We fabricated all-carbon-nanotube TEGs, use p-type developed, their...

To reduce consumption for ambient assisted living (AAL) applications, we propose the design and fabrication of flexible thin-film thermoelectric generators at a low manufacturing cost. The were fabricated using combination electrodeposition transfer processes. N-type Bi2Te3 films p-type Sb2Te3 formed on stainless-steel substrate employing potentiostatic nitric acid-based bath, followed by process. Three types fabricated. open circuit voltage (Voc) maximum output power (Pmax) measured...

Abstract We investigated the origin of n-type thermoelectric properties in single-wall carbon nanotube (SWCNT) films with anionic surfactants via experimental analyses and first-principles calculations. Several types were employed to fabricate SWCNT drop-casting, followed by heat treatment at various temperatures. In particular, sodium dodecylbenzene sulfonate (SDBS) surfactant heated 350 °C exhibited a longer retention period, wherein Seebeck coefficient lasted for maximum 35 days. x-ray...

As power sources for Internet-of-Things sensors, thermoelectric generators must exhibit compactness, flexibility, and low manufacturing costs. Stretchable flexible painted were fabricated on Japanese paper using inks with dispersed p- n-type single-walled carbon nanotubes (SWCNTs). The SWCNT the anionic surfactant of sodium dodecylbenzene sulfonate cationic dimethyldioctadecylammonium chloride, respectively. bundle diameters layers differed significantly; however, crystallinities both types...

Single-walled carbon nanotubes (SWCNTs) offer promise as materials for thermoelectric generators (TEGs) due to their flexibility, durability, and non-toxic nature. However, a key barrier application lies in high thermal conductivity, which hampers the generation of temperature differences TEGs. To address this challenge, we explored method enhancing heat dissipation SWCNT-based TEGs by coating SWCNT layers onto polymer mesh sheets. During TEG fabrication, achieving stable n-type SWCNT/mesh...

Single-walled carbon nanotubes (SWCNTs) are promising thermoelectric materials used in generators (TEGs) to power sensors. However, the limitation of SWCNTs is their high thermal conductivity, which makes it difficult create a sufficient temperature difference. In this study, we fabricated dip-coated SWCNT/mesh sheets using an SWCNT dispersion. Several types mesh were tested, and most suitable material was polyphenylene sulfide (PPS). uniformly deposited on PPS surface without filling...

Semiconducting single-walled carbon nanotubes (SWCNTs) are significantly attractive for thermoelectric generators (TEGs), which convert thermal energy into electricity via the Seebeck effect. This is because characteristics of semiconducting SWCNTs perfectly suited TEGs as self-contained power sources sensors on Internet Things (IoT). However, performances should be further improved by using sources. The ideal have a high electrical conductivity and coefficient while having low conductivity,...

Single-walled carbon nanotubes (SWCNTs) are promising candidates for use in thermoelectric generators (TEGs) to power Internet of Things (IoT) sensors. For practical applications, the major challenge SWCNTs is improving performance and thermal durability n-type SWCNT films. Here, inks were prepared using a dopant, which cationic surfactant dimethyldioctadecylammonium chloride (DODMAC), by changing mass ratio DODMAC/SWCNT. The films fabricated vacuum filtering, followed heat treatment at 423...